A heating device for heat treatment of tube panel weld seam

Abstract

The invention discloses a heating device for heat treatment of a welded joint in a tube panel. The heating device comprises a pair of heating boxes (1) capable of being spliced into a complete box body, wherein each heating box (1) comprises a bottom plate (11) and side plates (12) formed on the same side of the bottom plate (11) and defining a frame body; a heating sheet (2) positioned on the inner side of each heating box (1) and used for thermal radiation heating is arranged on each heating box (1); a part of side plates (12) can be pressed against the tube panel (3), and the other part of side plates (12) can be combined with one another, so that a heating space is formed between the heating boxes (1). As the heating space is formed between the heating boxes, radiation heating can be performed on the tube panel through the heating sheets, so that the problem of larger temperature gradient at the welded joint caused by direct heat conduction type heating can be solved, and the uniform heating of the welded joint can be realized, therefore, the heat treatment temperature of the welded joint is more uniform, and the heat treatment quality is improved.

Description

technical field [0001] The invention relates to the field of heat treatment heating, in particular to a heating device for heat treatment of tube panel welds. Background technique [0002] The high-temperature superheater and high-temperature reheater are important components of the high-temperature heating surface of the boiler, and together with the water-cooled wall and the economizer, they constitute the boiler furnace. The inlet and outlet sections of the high-temperature superheater and high-temperature reheater are connected to the header using new heat-resistant steel pipe fittings. After welding these pipe fittings to the high-temperature superheater and high-temperature reheater, they need to be repaired The welds of the pipe fittings are welded and heat treated. Post-weld heat treatment is to reduce the residual stress of welded joints and improve the structure and properties of weld metal. Due to the strong sensitivity to welding cracks of pipe fittings, the we...

AI Technical Summary

Problems solved by technology

However, this method has the disadvantages of cumbersome operation, difficult temperature control, uneven heating in the circumferential direction of the pipe, resulting in large residual stress in the structure, etc., which seriously affects the quality of heat treatment.

Especially for some high-temperature reheater tube panels, the upper and lower parts of the welded joint have different specifications and sizes, which makes the above heat treatment method more difficult and affects the heat treatment quality of the welded joint

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